Search Publications
Low-frequency Waves due to Newborn Interstellar Pickup He+ Observed by the Ulysses Spacecraft
Isenberg, Philip A.; Schwadron, Nathan A.; Murphy, Neil +8 more
We have surveyed magnetic field data from the Ulysses spacecraft and found examples of magnetic waves with the expected characteristics that point to excitation by newborn pickup He+. With interstellar neutrals as the likely source for the pickup ions, we have modeled the ion production rates and used them to produce wave excitation rat…
Stellar, Gas, and Dust Emission of Star-forming Galaxies out to z ∼ 2
Gronwall, Caryl; Ciardullo, Robin; Bowman, William P. +1 more
While dust is a major player in galaxy evolution, its relationship with gas and stellar radiation in the early universe is still not well understood. We combine 3D-Hubble Space Telescope emission-line fluxes with far-UV through far-IR photometry in a sample of 669 emission-line galaxies (ELGs) between 1.2 < z < 1.9 and use the MCSED spectral…
A Deep Census of Outlying Star Formation in the M101 Group
Mihos, J. Christopher; Harding, Paul; Watkins, Aaron E. +1 more
We present deep, narrowband imaging of the nearby spiral galaxy M101 and its group environment to search for star-forming dwarf galaxies and outlying H II regions. Using the Burrell Schmidt telescope, we target the brightest emission lines of star-forming regions, Hα, Hβ, and [O III], to detect potential outlying star-forming regions. Our survey c…
Radiation Belt Response to Fast Reverse Shock at Geosynchronous Orbit
Kanekal, Shrikanth G.; Sibeck, David; Bhaskar, Ankush +5 more
Fast reverse shocks (FRSs) cause the magnetosphere to expand, by contrast to the well-known compressions caused by the impact of fast forward shocks (FFS). Usually, FFSs are more geoeffective than FRSs, and consequently the inner magnetosphere dynamic responses to both shock types can be quite different. In this study, we investigate for the first…
Retrieving Exoplanet Atmospheres Using Planetary Infrared Excess: Prospects for the Night Side of WASP-43 b and Other Hot Jupiters
Lustig-Yaeger, Jacob; Stevenson, Kevin B.; Mayorga, L. C. +4 more
To increase the sample size of future atmospheric characterization efforts, we build on the planetary infrared excess (PIE) technique that has been proposed as a means to detect and characterize the thermal spectra of transiting and non-transiting exoplanets using sufficiently broad wavelength coverage to uniquely constrain the stellar and planeta…
Deciphering the 3D Orion Nebula. II. A Low Ionization Region of Multiple Velocity Components Southwest of θ1 Ori C Confounds Interpretation of Low Velocity Resolution Studies of Temperature, Density, and Abundance
Abel, N. P.; O'Dell, C. R.; Ferland, G. J.
We establish that there are two velocity systems along lines of sight that contribute to the emission-line spectrum of the brightest parts of the Orion Nebula. These overlie the Orion-S embedded molecular cloud southwest of the dominant ionizing star (θ1 Ori C). Examination of 10 × 10″ samples of high spectral resolution emission-line s…
Cross-match between the Latest Swift-BAT and Fermi-LAT Catalogs
Mukherjee, Reshmi; Yoneda, Hiroki; Inoue, Yoshiyuki +4 more
We report the results of a cross-match study between the hard X-ray and GeV gamma-ray catalogs, by making use of the latest 105 month Swift-Burst Alert Telescope (BAT) and 10 yr Fermi-Large Area Telescope (LAT) catalogs, respectively. The spatial cross-matching between the two catalogs results in the matching of 132 point-like sources, including ~…
Probing the Nucleosynthetic Contribution of Low-metallicity, Low-mass Star Companions of CEMP Stars
Shejeelammal, J.; Goswami, Aruna
The observed abundance diversities among CEMP stars can shed light on the formation and evolution of elements in the early Galaxy. In this work, we present results obtained from a detailed abundance analysis of a sample of seven extrinsic carbon stars. The analysis is based on high-resolution spectra obtained with HCT/HESP (R~60,000) and SUBARU/HD…
Signature of a Massive Rotating Metal-poor Star Imprinted in the Phoenix Stellar Stream
Lewis, Geraint F.; Casey, Andrew R.; Erkal, Denis +13 more
The Phoenix stellar stream has a low intrinsic dispersion in velocity and metallicity that implies the progenitor was probably a low-mass globular cluster. In this work we use Magellan/Magellan Inamori Kyocera Echelle (MIKE) high-dispersion spectroscopy of eight Phoenix stream red giants to confirm this scenario. In particular, we find negligible …
A Search for TeV Gamma-Ray Emission from Pulsar Tails by VERITAS
Kargaltsev, Oleg; Klingler, Noel; Benbow, W. +55 more
We report on the search for very-high-energy gamma-ray emission from the regions around three nearby supersonic pulsars (PSR B0355+54, PSR J0357+3205, and PSR J1740+1000) that exhibit long X-ray tails. To date there is no clear detection of TeV emission from any pulsar tail that is prominent in X-ray or radio. We provide upper limits on the TeV fl…